Wabash River

The Wabash River is a 765 kilometer (475 mile) long river in the eastern United States that flows southwest from northwest Ohio near St. Henry, Ohio across northern Indiana to Illinois where it forms the southern Illinois-Indiana border before draining into the Ohio River, of which it is the largest northern tributary.

In the above illustration, the Wabash River is highlighted in blue. The green area is its watershed.

The major tributaries of the Wabash are the Tippecanoe and White Riverss, both in Indiana. The major Illinois tributary is the Little Wabash River.

From the dam in Huntington to its terminus at the Ohio River, the Wabash flows freely for 661 kilometers (411 miles) which makes it the longest stretch of free-flowing river in the United States east of the Mississippi River